Doepfer A-100(~ 40 MB) - Manual (Page 9)

doepfer System A - 100 2. Overall design
3
2. Overall design
2.1 Introduction
For the A-100 modular system different types of cases
are available. As an example the 19” rack version
A-100 G6 is described here. The selected modules
can be fitted in any chosen layout into the case in
question.
The
A-100G6 (see Fig. 1) conforms to the 19” stan-
dard, and consists of two sections each 3U high, tied
together by 6U side panels. It contains two system
busses (
1
), the internal power supply (
2
) , and the
main electrical supply socket (
3
).
Module front panels are all 3U high. Their width is
measured in HP (1 HP = 5.08 mm). The A-100G6 has
a
usable width of 84 HP (see Fig. 1). If the modules
you install don’t use up the entire 84 HP, then you must
cover up the spaces with
blanking panels.
The A-100G6 contains two bus boards, to each of
which up to 14 modules can be connected, using the
ribbon cable that comes with the modules. The bus
board serves to supply power to the modules, and also
to send control voltages etc. to some of the modules
(see Chapter 3).
Fig. 1: A look inside the A-100G6
Other cases may have a different width, more or less
HU and more or less bus boards and power supplies.
Each power supply A-100PSU2 produces voltages of
+12 V and -12 V and can put out a
maximum current
of 1200 mA. In setting up a modular system, make
sure that the total current required by all the modules
doesn’t exceed this maximum. If it does, then a
second power supply will need to be installed (at
position
4,
Fig.1). But as a rule, though, one power
supply should be sufficient for a rack system.
4
2
3 HU
84 HP
1
1
3